Flow charts are easy-to-understand diagrams that show how the steps of a process fit together. American engineer Frank Gilbreth is widely believed to be the first person to document a process flow, having introduced the concept of a “Process Chart” to the American Society of Mechanical Engineers in 1921.

Flow charts tend to consist of four main symbols, linked with arrows that show the direction of flow:
1. Elongated circles, which signify the start or end of a process.
2. Rectangles, which show instructions or actions.
3. Diamonds, which highlight where you must make a decision.
4. Parallelograms, which show input and output. This can include materials, services or people.

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